China announces imposition of oil sanctions on North Korea from Oct 1

Trump praised China on Thursday for what he said was instructions to its banks to cut off business with North Korea.

The administration said in a statement on its website that the quake, which occurred around 0830 GMT, was recorded a depth of zero kilometres.

The quake was detected in an area around Kilju, in northeastern North Korea, just 6 kilometers (3.7 miles) northwest of where the North conducted its sixth and most powerful nuclear test on September 3, according to an official from Seoul's Korea Meteorological Administration.

There seemed to be some initial difference of opinion, however, with Seoul's Korea Meteorological Agency (KMA) saying that it had registered a tremor of a similar size, but judged it a "natural quake". They believe the activity was the result of a natural quake. "A sound wave, which is usually generated in the event of an artificial natural disaster, was not detected". In this case we saw none.

The US Geological Survey said it could not conclusively confirm whether the quake, which it measured at magnitude 3.5, was man-made or natural.

Punggyeri nuclear site is located in Kilju where the quake was detected, the official added.

"As long as North Korea continues its provocations, South Korea will keep considering various actions in cooperation with the U.S.to intensify worldwide pressure on North Korea", the foreign ministry said. In two July flight tests, those missiles showed potential capability to reach deep into the US mainland when perfected.

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Lassino Zerbo, of nuclear watchdog the Comprehensive Test Ban Treaty Organisation (CTBTO), tweeted that the quake was not man-made but similar to a "collapse" event, or tremor, that followed nearly immediately after the 3 September test.

A secondary tremor detected after that test could have been caused by the collapse of a tunnel at the mountainous site, experts said at the time.

The September test was North Korea's sixth and most powerful detonation, triggering a much stronger 6.3-magnitude quake that was felt across the border in China.

The Ministry of Commerce said in a statement on its website that China would limit exports of refined petroleum products from October 1, ban exports of condensates and liquefied natural gas and imports of textiles immediately.

Trump has dubbed Kim a "madman" and sought to ratchet up sanctions against the isolated regime, which says it needs nuclear weapons to protect itself against the threat of invasion.

The quake comes as the worldwide community is on a high alert after North Korea's foreign minister threatened on Thursday to test a hydrogen in the Pacific Ocean in response to President Trump's United Nations speech, in which he threatened to destroy North Korea, if they continued to threaten the USA and their allies.

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